MOUNT RAINIER, Md. (AP) - Prosecutors have dropped charges against a Maryland man accused of beating a 72-year-old man with a baseball bat.

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The Washington Post reports that investigators no longer believe 22-year-old Justin C. Strong of Mount Rainier was responsible for the September attack.

State's attorney's office spokesman John Erzen says investigators now think 20-year-old Edwin M. Gonzalez was responsible.

Strong has been released from jail and Gonzalez has been arrested and charged with attempted first-degree murder and related counts.

Police say someone brandished a knife and demanded the victim's wallet about 6 a.m. on Sept. 15 on Bladensburg Road.

When the victim refused, the would-be robber left and returned with aluminum baseball bat.

The victim was hospitalized with serious injuries.

Information from: http://www.washingtonpost.com.